<!DOCTYPE html>
<html>
<meta charset="utf-8">
<head>
  <style>
    body {
      width: 150px;
      height: 80px;
      padding: 10px;
    }
    button {
      width: 100%;
      height: 50px;
      font-size: 16px;
      cursor: pointer;
    }
    .active {
      background-color: #4CAF50;
      color: white;
    }
  </style>
</head>
<body>
  <button id="startBtn">开始自动弹窗</button>
  <script src="popup.js"></script>
</body>
</html>